Abstract
Recent time-reversal mirror (TRM) experiments conducted in the Mediterranean Sea in May 1997 extended the range of focus from the earlier results of 6 km to 30 km [Kuperman et al., J. Acoust. Soc. Am. 101, 3088 (1997)]. Ideally, the probe source (PS) should be in the vertical SRA-VRA plane. However, for practical reasons the PS was placed several hundred meters out of this plane. This geometry did not introduce any significant errors at 6 km range in the April 1996 experiment. In the May 1997 experiment, the authors conducted a source tow in which the PS moved along the arc of a circle at a range of 15 km from the SRA and maximum transverse offsets of 1 km from the VRA. The TRM focus appeared robust to the transverse offset of the source from the VRA on one side of the SRA-VRA plane, but defocused on the other side of the plane. Backpropagation simulations reveal that the TRM focusing along this 15-km, mildly range-dependent region is quite sensitive to the geo- acoustic properties of the seafloor, e.g., sediment layer thickness and sound speed gradient. This sensitivity is explored to determine the geoacoustic properties of the seafloor.
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